Zahra'u told journalists: "They said, 'Can you do it?' I said no.
"They said, 'You will go to heaven if you do it.' I said, 'No I can't'. They said they would shoot me or throw me into a dungeon."
There was no way to independently verify her story and she had no lawyer present. No information was available concerning the whereabouts of her parents.
Police said they had instructed the girl to tell her story to boost public awareness of those responsible for the December 10 attack.
Faced with the threat of death, Zahra'u said she finally agreed to take part in the attack but "never had any intention of doing it".
Several days later, Zahra'u said, she and three other girls, all wearing explosives, were brought to the Kantin Kwari market by unidentified men.
Zahra'u said she was injured when one of the girls detonated her bomb and then she fled the scene, ending up at a hospital on the outskirts of Kano where she was discovered to be carrying explosives.